Nature of ordnance. 
THE ROYAL ARTILLERY INSTITUTION. 
177 
70-pr. 
shell 
t 
12-pr|| 
Projectile. 
B-Sf 
shell 
t 
i.s.§ 
72-5 
C. F. 
t 
too . 
■Ji 
m 
lhs. oz. 
2 10 
ft 
600 
nil. 
Effects. 
"§ ' 
^ 00 
rd 
o 
°.a 
fcC 
Lei r d 
00 
IQ 
•S g . 
|.a 
\t‘B 
'S-S 
a ’a 
§g 
& 
rd.S . 
£.3 f 
03 
ns 
=».3 
i-i w 
*8 
‘o 
o 
ft 
1148 
Remarks. 
Struck the top plate 6" from the 
side and 6'5" from the bottom, and 
hurst in the backing, which it 
penetrated to a depth of 11"; a 
large part of the shell remained in 
the rear baulk of the backing; a 
length of 8' of the front baulks 
very much damaged 1' of it being blown out for a depth of 2' from the top, and 3" in thickness of 
the remaining 2' blown out for the same depth; the rear baulk was forced up 3" for a length 
of 2'6 "; two bolts in the lower row started respectively 1" and *5"; a crack from a bolt-hole to 
the bottom of the plate at 10" from the point of impact, also a crack 2" long immediately under 
the hole made by round No. 5; plate started out 1-25" on the right side, being now 2-5" from 
the backing; the butt of the shell was picked up 190 yds. in front of the target. No damage visible 
on the inside. 
The shell broke into fifteen pieces; fragments:—two pieces of plate (one punched out). 
69-14 „ „ „ Blind 59' „ „ 1-55 6* ... 1146 Struck the centre plate 6" from the 
” top and 2' 8-5" from the right side ; 
the top of the plate driven in 4" 
for alength of -8"; a crack 8" long 
extended from the top of the 
plate through a bolt-hole; no 
damage visible inside. 
The shot broke into seven large 
pieces and twenty-four small. 
7-5" If ... 5' 200 „ *85 . Fired at 2-5" plates (unbacked) at an 
angle of 45°. Plate starred at the 
rear, with three narrow cracks 
about 1" long; the shot broke up. 
No damage at the rear; the shot 
broke up. 
12-4 „ 8f" „ Blind 9' .Struck the target 2'5" from the side. 
where the plate was supported on 
a framework of wood 8" thick; 
broke a hole in the plate and re¬ 
mained in it, projecting 7'5 // on its 
upper and 4 " on its under side, 
the timber baulk was smashed 
through for a length of 2'. The 
shell set up •2 // . 
7*1" „ „ 8' . Struck the plate 1' 5" from the side, 
and made a hole measuring 
5*3" x 3-3" in front, and 7-5" x 8" in 
rear; the shot bounded back, and 
was picked up 25 yds. in front of 
the target. Set up •2 // . 
Struck near the last round, and made 
a hole 4-9" x 3 - l", and at the back the fracture had joined into that of last round, the hole now 
measuring 12" x 6-5" ; the shot penetrated, and fell at the foot of the target, and was set up -1". 
Breech-loading rifled gun. 
•Jf Solid shot, cast-iron. 
September 8th. 
The following experiments were to try the value of millboard as a backing 
to armour-plates:— 
A piece of millboard 1' 3" x Y 8*5" x 8" was secured in rear of an iron 
plate thick, the millboard resting against a plate backed by granite. 
The gun used was a 6-pr. Armstrong rifled gun, with solid cast-iron shot 
and service charge, at 50 yds. range. 
